Actually this theory is pretty decent. Although you would have no knowledge of living a 2nd time?Else you would have influence on everything.

I think that i read in some orthodox-christian book,that in our souls, know what we have to do on earth,our journey here,but in the moment we born an angel "wipe"all the knowledge we have ,and from here the "deja vu " moments.........

Belief in re-incarnation won't do. You will have to know for certain whether or not consciousness continues past death.

The point is not whether or not consciousness continues past death. The point is your attitude towards life for either of the scenarios. If consciousness does continue past death, how would you lead your life? If it does not, how would you lead your life?